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Problem getting radio serial number

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I just purchased a used 2009 Honda Civic LX. The car did not come with the radio codes and I cant find the serial number for the radio anywhere. I read another post and it says to use the preset 1 & 6 keys together to get two series of 4 numbers each which wehen used together are the serial number for the radio.

The problem that I am having is that when I push the 1 and 6 preset and turn on the radio, instead of two sets of numbers, I simply get DIAG.

Can anyone help with this one. Is there any other way to get the serial number?

Look through your glovebox and find your service history book. The radio code could be in there. Also look around the inside and outside of the glovebox itself for a white sticker. It will either have a 5 digit number which is the radio code, or it will have a 8 digit number which is the serial number. Good luck.